Compressor



April 25, 1933.

D. F. FESLER COMPRESSOR Original Filed Nov. 16 1921 Patented Apr. 25,1933 DOUGLAS F. FESLER, OF EVANSTON, ILLINOIS, ASSIGNOR TO ALEMITECORPORATION, OF

CHICAGO, ILLINOIS, A CORPORATION OF DELAWARE COMPRESSOR Applicationfiled November 16, 1921, Serial No. 515,460. Renewed July 7, 1930.

My invention relates to improvements in compressors, and is particularlyconcerned with the provison of a novel compressor adapted to form a partof a well-known lubricating system, comprising a plurality of fittingsor nipples to be secured to the various bearings on the machine to belubricated, and a compressor for supplying lubricant to the fittings,the compressor comprising a discharge conduit having a coupling forsuccessively making sealed connections with said fittings.

The objects of my present invention are First: To provide a compressorby means of which lubricant under exceedingly high pressure can beeasily delivered to the littings;

Second: To provide a compressor of the character described comprisingmeans for rapidly forcing a comparatively large amount of lubricant intoa bearing, where the resistance of the bearing is small, but which, atthe same time, embodies means for supplying lubricant to the bearingsunder high pressure where such high pressure 1s necessary for forcingthe lubricant between the surfaces to be lubricated;

Third: To provide a compressor having a discharge conduit whichcomprises a sealing member and a valve co-acting in a novel manner, and

Fourth: To provide a construction of the character specified which issimple, economical to manufacture, rugged and easy to opcrate.

Other objects will appear as this descrip- Vtion progresses, referencebeing had to the accompanying drawing, in which Figure 1 shows myimproved compressor in side elevation, and Y Figure 2 is a centrallongitudinal section through the discharge conduit forming apart of mycompressor.

In both views, similar reference characters will be used for referringto similar parts.

Y Referring to the drawing, my improved compressor comprises a lowpressure cylinder or barrel 5, one end of which is closed by asui-table'cap 6, which can be removed for the purposes of filling thecompressor. A screw 'threaded plunger rod 7 is threaded through I theclosed end 11 of the low pressure cylinder. rlhe construction thus fardisclosed is well-known to those skilled in this art, and is purelyconventional in character and forms no part of my present inventionexcept as it co-acts with the remaining elements about j to bedescribed.

The discharge conduit of my improved compressor comprises a guide tube12, one end of which is reduced in cross-section and threaded as shownat 13, so that it can be connected with the internally threaded nipple10. Adjacent lits inner end, the guide tube 12 is internally threaded asshown at 15 to receive the externally and internally threaded collar 16.The inner end of the plunger tube 17 is threaded into the bore of thecollar 16, so as to support the plunger tube 17 in spaced relation tothe walls of the .guide tube 12. The inner end of the high pressure tubeor cylinder 18 is slidably mounted in the outer end of the guide tube12, and surrounds the plunger tube 17, as shown in Figure 2. To providea tight joint between the end of the tuber18 and the plunger tube 17, Iprovide suitable packing 19, and a. follower 20, the outer end of whichis provided with slots 21 for receiving a Spanner wrench. Preferably,theV outer end of the plunger tube 17 is provided with a collar orenlargement 22, which co-acts with the shoulder 23 atthe inner end ofthe tube 18 to limit the outward movement of the tube 18 with respect tothe guide tube 12. v

A sleeve 211 is threaded upon the outer end of the high pressure tube orcylinder 18. The outer endof thebore of the sleeveis contractedtoprovide a seat 25 for the flexible gasket or'cup leather 26. A` valve27 seats 95 The helicalspring 30 positioned between the out-er end ofthe tube 18, and the valve 27 yieldingly holds the latter upon its seat.

I also provide means at the inner end of the discharge conduit forpreventing the high pressure developed in the high pressure cylinder ortube 18 from being transmitted to the low pressure cylinder, this meanscomprising a check valve 31, the inner face of which is provided with aprojecting member 32, which, when the valve 'is seated, extends throughthe opening in the gasket 33. A helical spring 34 yieldingly holds valve31 upon its seat. The outer face of the valve 31 is provided with aprojection 35 for keeping kthe adjacent endvof the spring centered uponthe valve. i

Although it is not necessary for the successful operation of my improvedcompressor, the outer end of the sleeve .24 may, if desired, be providedwith bayonet slots 36 for receiving the projecting ends of the pin 37,forming a part of the nipple or fitting 38, so as'to make av lockedattachment to the fitting. The fitting 38 is of the usual wellknown typecomprising a non-return valve 40,

and a spring 41, seated between it and the 'pin ,37 for yieldinglyholding the closure 40 in its closed position.

vIn using my yimproved compressor, the

l outer end of the sleeve 24 is placed over and around the outer end ofthe nipple 38, as shown in Figure l, and the operator then .rotates theplunger rod 7 by means of a fhandle 9, thereby causing the plunger 8 tomove inwardly in the low pressurelbarrel or cylinder 5, thus forcinglubricant past the valve V31 into the chamber between the end .of theguide tube 12 and the inner end of the plunger tube 17, and from thencethrough the plunger tube into the high pressure cylinder 18. From thehigh pressure cylinder 18, the lubricant iiows past the valve 27 (whichhas been raised by the engagement of its stem 28 with the closure 40)and into the fitting 38 and from thence to the bearing. If the re- ,ysistance to the passage of lubricant into the bearing is so great as tomake the turning of the handle 9 difcult, the operator simply pushesupon the handle 9, or the barrel 5, or both,in the direction of the axisofthe discharge conduit, whereupon the plunger tube 17 will be forcedinto the high pressure cylinder or tube 18, and displace lubricanttherefromv past the valve 27 through the tting and into the bearing.' Itwill be noted that the diameter ofthe plunger tube 17 is comparal'tivelysmall, so that pressures of aV thousand pounds or more per square inchcan easily be developed in the high pressure cylinder 18.

In Vmaking an attachment or connection with a fitting 38, the outer endof the valve stem 28 iirstmakes contact with the closure 40, and becauseof the greater tension of the spring 30, it causes the closure 40 toopen against the tension of the spring 41. The

closure 40, however, has a limited movement, and when it reaches the endof this movement it acts as an abutment for the valve stem 28, so thatupon further movement of the sleeve 24 toward the fitting 38 this valveis lifted from its seat upon the gasket 26 but immediately thereafterthe gasket 26 comes into contact with the end of the fitting 38 andmakes a sealed connection with this iitting. When the plungerin thebarrel 5 is operated to force lubricant into the discharge conduit,under pressure, the pressure of the lubricant upon the inner face of thegasket 26 causes it to be forced tightly against the end of the fitting38 and the greater the pressure, the better the seal between these twomembers so that there is no opportunity for lubricant to escape throughthe joint.

After the three members 12, 17 and 18 have been telescoped within eachother by exertion of pressure upon the handle of barrel, to return themto their former position it is merely necessary toremove the sleeve 24from the fitting and turn the handle 9 throughy a ycouple ofV rotations,whereupon the pressure of the lubricant against the valve 26 will causet-he high pressure cylinder to move outwardly to the position shown inFigure 2.

" While I have described the details ofcon-vA thus described myinvention, what cylinder having a Vdischarge conduit comprising, a guidetube communicating with said low pressure cylinder, a plunger tubemounted within said guide tube, and communicating with the interiorthereof, the outer end of said plunger tube being freely supported.

in spaced relation to the walls of said guide tube, a high pressurecylinder surrounding the free end of said plunger tube and slidablebetween said plunger tubeand said guide tube, an outwardly opening checkvalve be# tween said high pressure cylinder and said low pressurecylinder, means. for limiting the movement of. said high pressurecylinder relative to said plunger tube, and a coupling member carried bythe free end of said high pressure cylinder, y

2. A compressor comprising a low pressure cylinder having a dischargeconduit including a guidel tube connnunicating with said low pressurecylinder, a plunger'mounted within said guide tube, said plunger havinga lubricant passageway the outer end of said plungertube being freelysupported in spaced relation to the walls of said guide tube, a highpressure cylinder surrounding the free end of said plunger and slidablebetween said plunger and said guide tube, means for limiting themovement of said high pressure cylinder relative to said plunger, and acou pling member carried by the free end of said high pressure cylinder.

3. A lubricant compressor comprising a barrel, compressing meanscomprising cylinder and plunger elements having relative telescopingmovement for receiving lubricant from said barrel and ejecting lubricantunder pressure, and separate cylindrical guide means rigid With saidbarrel for guiding the movement of one of said elements.

4. A lubricant compressor comprising a barrel, compressing meanscomprising cylinder and plunger elements having relative telescopingmovement for receiving lubricant from said barrel and ejecting saidlubricant under pressure, and a guide sleeve movable With one of saidelements and telescopable with the other of said elements.

5. A lubricant compressor comprising a barrel, means for discharginglubricant from said barrel, compressing means comprising cylinder andplunger elements having relative telescopic movement for receivinglubricant from said barrel and ejecting lubricant under pressure, valvemeans interposed between said barrel and said compressing means, BO'andguide means rigid With said barrel for guiding the movement of one ofsaid elements.

In witness whereof, I hereuntosubscribe my name this 9th day ofNovember, 1921.

DOUGLAS F. FESLER.

